#include "pwm.h"

void PWM_Init(u16 arr,u16 psc)//tim4
{  
	GPIO_InitTypeDef GPIO_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
 
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);// 
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);  //
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_8|GPIO_Pin_7|GPIO_Pin_6; //
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	TIM_TimeBaseStructure.TIM_Period = arr; //
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; //
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //
	TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //
	
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //
	TIM_OCInitStructure.TIM_Pulse = 0; //
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //
	TIM_OC4Init(TIM4, &TIM_OCInitStructure);  //
	TIM_OC3Init(TIM4, &TIM_OCInitStructure);
	TIM_OC2Init(TIM4, &TIM_OCInitStructure);
	TIM_OC1Init(TIM4, &TIM_OCInitStructure);
 
  TIM_CtrlPWMOutputs(TIM4,ENABLE);	//
 
	TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);  //
	TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
	TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
	TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
	
	TIM_ARRPreloadConfig(TIM4, ENABLE); //
	
	TIM_Cmd(TIM4, ENABLE);  //
 
   
}

